PBT（聚对苯二甲酸丁二醇酯）和PC（聚碳酸酯）都是常见的工程塑料，它们在性能上有各自的优势和劣势。以下是根据给定搜索结果对手的详细分析。

both PBT and PC exhibit high strength and good dimensional stability. However, their mechanical properties differ in certain aspects. PBT is known for its stiffness, which is not significantly affected by temperature. This means that PBT parts maintain their rigidity even at elevated temperatures. On the other hand, PC has a higher impact resistance and geometric stability, making it more suitable for applications requiring toughness and flexibility.

In terms of thermal stability, PBT has an advantage over PC. PBT can withstand higher temperatures without significant deformation or degradation. Its UL (Underwriters Laboratories) temperature index is around 120-140°C, indicating its good resistance to heat aging. PC, on the other hand, has a lower melting point and is more prone to热变形 at elevated temperatures

Both PBT and PC have excellent electrical insulation properties, with a low介电系数 of around 3.0-3.2. They also exhibit good耐电弧性, with a duration of about 120 seconds. However, when it comes to moisture resistance, PC tends to perform better than PBT. PC can maintain its electrical performance even in潮湿 or高温 conditions, while PBT may experience issues in such environments

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